Adapt the code for glibc 2.28
Adapt the code for glibc 2.28

Replace the following references:
 - _IO_size_t with size_t;
 - _IO_FILE with FILE.

Signed-off-by: Tulio Magno Quites Machado Filho <0e1b3d0765ee75ed64fa2e34822e4949a70a1429@linux.ibm.com>

gftg85/libdfp,gftg85/libdfp,gftg85/libdfp,gftg85/libdfp